Magisk/native/jni/magiskboot/ramdisk.cpp

267 lines
6.6 KiB
C++
Raw Normal View History

2018-09-27 09:11:10 +02:00
#include <string.h>
#include <stdlib.h>
2017-12-01 10:17:24 +01:00
#include <sys/stat.h>
#include "magiskboot.h"
#include "cpio.h"
2018-09-27 09:11:10 +02:00
#include "utils.h"
2017-12-01 10:17:24 +01:00
2018-10-25 03:08:06 +02:00
class magisk_cpio : public cpio {
public:
magisk_cpio(const char *filename) : cpio(filename) {}
void patch(bool keepverity, bool keepforceencrypt);
int test();
char * sha1();
void restore();
void backup(const char *orig);
2018-10-25 03:08:06 +02:00
};
void magisk_cpio::patch(bool keepverity, bool keepforceencrypt) {
fprintf(stderr, "Patch with flag KEEPVERITY=[%s] KEEPFORCEENCRYPT=[%s]\n",
keepverity ? "true" : "false", keepforceencrypt ? "true" : "false");
2018-10-25 03:08:06 +02:00
for (auto &e : arr) {
if (!e)
continue;
2018-11-07 08:10:38 +01:00
bool fstab = (!keepverity || !keepforceencrypt) &&
!e->filename.starts_with(".backup") &&
e->filename.contains("fstab") && S_ISREG(e->mode);
2017-12-01 10:17:24 +01:00
if (!keepverity) {
2018-11-07 08:10:38 +01:00
if (fstab) {
2017-12-20 20:36:18 +01:00
patch_verity(&e->data, &e->filesize, 1);
2018-11-07 08:10:38 +01:00
} else if (e->filename == "verity_key") {
2017-12-01 10:17:24 +01:00
fprintf(stderr, "Remove [verity_key]\n");
2018-10-25 03:08:06 +02:00
delete e;
e = nullptr;
continue;
2017-12-01 10:17:24 +01:00
}
}
if (!keepforceencrypt) {
2018-11-07 08:10:38 +01:00
if (fstab) {
2017-12-20 20:36:18 +01:00
patch_encryption(&e->data, &e->filesize);
2017-12-06 18:30:48 +01:00
}
}
}
}
2018-10-25 03:08:06 +02:00
2018-08-09 12:13:07 +02:00
#define STOCK_BOOT 0x0
#define MAGISK_PATCH 0x1
#define UNSUPPORT_PATCH 0x2
2018-10-25 03:08:06 +02:00
int magisk_cpio::test() {
static const char *UNSUPPORT_LIST[] = { "sbin/launch_daemonsu.sh", "sbin/su", "init.xposed.rc",
2018-11-07 08:10:38 +01:00
"boot/sbin/launch_daemonsu.sh" };
2018-10-25 03:08:06 +02:00
static const char *MAGISK_LIST[] = { ".backup/.magisk", "init.magisk.rc",
2018-11-07 08:10:38 +01:00
"overlay/init.magisk.rc" };
2017-12-20 20:36:18 +01:00
2018-11-07 08:10:38 +01:00
for (auto file : UNSUPPORT_LIST)
if (find(file) >= 0)
2018-08-09 12:13:07 +02:00
return UNSUPPORT_PATCH;
2018-11-07 08:10:38 +01:00
for (auto file : MAGISK_LIST)
if (find(file) >= 0)
2017-12-20 20:36:18 +01:00
return MAGISK_PATCH;
return STOCK_BOOT;
2017-12-06 18:30:48 +01:00
}
#define for_each_line(line, buf, size) \
for (line = (char *) buf; line < (char *) buf + size && line[0]; line = strchr(line + 1, '\n') + 1)
2018-11-07 08:10:38 +01:00
char *magisk_cpio::sha1() {
2017-12-06 18:30:48 +01:00
char sha1[41];
char *line;
2018-10-25 03:08:06 +02:00
for (auto &e : arr) {
2017-12-20 20:36:18 +01:00
if (!e) continue;
2018-11-07 08:10:38 +01:00
if (e->filename == "init.magisk.rc" || e->filename == "overlay/init.magisk.rc") {
for_each_line(line, e->data, e->filesize) {
if (strncmp(line, "#STOCKSHA1=", 11) == 0) {
strncpy(sha1, line + 12, 40);
sha1[40] = '\0';
return strdup(sha1);
}
}
} else if (e->filename == ".backup/.magisk") {
for_each_line(line, e->data, e->filesize) {
if (strncmp(line, "SHA1=", 5) == 0) {
strncpy(sha1, line + 5, 40);
2017-12-06 18:30:48 +01:00
sha1[40] = '\0';
return strdup(sha1);
}
}
2018-11-07 08:10:38 +01:00
} else if (e->filename == ".backup/.sha1") {
2018-10-25 03:08:06 +02:00
return (char *) e->data;
}
}
return nullptr;
}
void magisk_cpio::restore() {
for (auto &e : arr) {
if (!e) continue;
2018-11-07 08:10:38 +01:00
if (e->filename.starts_with(".backup")) {
2018-10-25 03:08:06 +02:00
if (e->filename[7] == '\0') continue;
if (e->filename[8] == '.') {
2018-11-07 08:10:38 +01:00
if (strcmp(&e->filename[8], ".rmlist") == 0) {
2018-10-25 03:08:06 +02:00
for (int pos = 0; pos < e->filesize; pos += strlen((char *) e->data + pos) + 1)
2018-11-07 08:10:38 +01:00
rm((char *) e->data + pos, false);
2018-10-25 03:08:06 +02:00
}
} else {
mv(e->filename, e->filename + 8);
}
2017-12-06 18:30:48 +01:00
}
}
2018-10-25 03:08:06 +02:00
// Some known stuff we can remove
2018-11-07 08:10:38 +01:00
rm(".backup", true);
rm("overlay", true);
rm("sbin/magic_mask.sh", false);
rm("init.magisk.rc", false);
rm("magisk", true);
2017-12-06 18:30:48 +01:00
}
void magisk_cpio::backup(const char *orig) {
Vector<cpio_entry*> bak;
cpio_entry *m, *n, *rem;
2017-12-06 18:30:48 +01:00
char buf[PATH_MAX];
2018-10-25 03:08:06 +02:00
m = new cpio_entry();
2018-11-07 08:10:38 +01:00
m->filename = ".backup";
2017-12-06 18:30:48 +01:00
m->mode = S_IFDIR;
2018-10-25 03:08:06 +02:00
bak.push_back(m);
2017-12-06 18:30:48 +01:00
2018-10-25 03:08:06 +02:00
rem = new cpio_entry();
2018-11-07 08:10:38 +01:00
rem->filename = ".backup/.rmlist";
2017-12-06 18:30:48 +01:00
rem->mode = S_IFREG;
2018-11-07 08:10:38 +01:00
magisk_cpio o(orig);
2018-10-25 03:08:06 +02:00
2017-12-06 18:30:48 +01:00
// Remove possible backups in original ramdisk
2018-11-07 08:10:38 +01:00
o.rm(".backup", true);
rm(".backup", true);
2017-12-06 18:30:48 +01:00
2018-10-25 03:08:06 +02:00
// Sort both CPIOs before comparing
o.sort();
sort();
2017-12-06 18:30:48 +01:00
// Start comparing
size_t i = 0, j = 0;
2018-10-25 03:08:06 +02:00
while(i != o.arr.size() || j != arr.size()) {
2018-11-07 08:10:38 +01:00
int res;
bool backup = false;
2018-10-25 03:08:06 +02:00
if (i != o.arr.size() && j != arr.size()) {
m = o.arr[i];
n = arr[j];
2018-11-07 08:10:38 +01:00
res = m->filename.compare(n->filename);
2018-10-25 03:08:06 +02:00
} else if (i == o.arr.size()) {
n = arr[j];
2017-12-06 18:30:48 +01:00
res = 1;
2018-10-25 03:08:06 +02:00
} else if (j == arr.size()) {
m = o.arr[i];
2017-12-06 18:30:48 +01:00
res = -1;
}
if (res < 0) {
// Something is missing in new ramdisk, backup!
++i;
2018-10-25 03:08:06 +02:00
backup = true;
2017-12-06 18:30:48 +01:00
fprintf(stderr, "Backup missing entry: ");
} else if (res == 0) {
++i; ++j;
if (m->filesize == n->filesize && memcmp(m->data, n->data, m->filesize) == 0)
continue;
// Not the same!
2018-10-25 03:08:06 +02:00
backup = true;
2017-12-06 18:30:48 +01:00
fprintf(stderr, "Backup mismatch entry: ");
} else {
// Something new in ramdisk, record in rem
2017-12-06 18:30:48 +01:00
++j;
2018-11-07 08:10:38 +01:00
rem->data = xrealloc(rem->data, rem->filesize + n->filename.size());
memcpy((char *) rem->data + rem->filesize, n->filename, n->filename.size());
rem->filesize += n->filename.size();
fprintf(stderr, "Record new entry: [%s] -> [.backup/.rmlist]\n", n->filename.c_str());
2017-12-06 18:30:48 +01:00
}
if (backup) {
2018-11-07 08:10:38 +01:00
sprintf(buf, ".backup/%s", m->filename.c_str());
fprintf(stderr, "[%s] -> [%s]\n", m->filename.c_str(), buf);
m->filename = buf;
2018-10-25 03:08:06 +02:00
bak.push_back(m);
2017-12-06 18:30:48 +01:00
// NULL the original entry, so it won't be freed
2018-10-25 03:08:06 +02:00
o.arr[i - 1] = nullptr;
2017-12-06 18:30:48 +01:00
}
}
2017-12-20 20:36:18 +01:00
if (rem->filesize)
2018-10-25 03:08:06 +02:00
bak.push_back(rem);
2017-12-20 20:36:18 +01:00
else
2018-10-25 03:08:06 +02:00
delete rem;
if (bak.size() > 1)
insert(bak);
2017-12-06 18:30:48 +01:00
}
2017-12-06 05:51:16 +01:00
2017-12-20 20:36:18 +01:00
int cpio_commands(int argc, char *argv[]) {
2017-12-01 10:17:24 +01:00
char *incpio = argv[0];
++argv;
--argc;
2017-12-20 20:36:18 +01:00
2018-11-07 08:10:38 +01:00
magisk_cpio cpio(incpio);
2017-12-03 20:14:04 +01:00
2017-12-20 20:36:18 +01:00
int cmdc;
char *cmdv[6];
2017-12-06 05:51:16 +01:00
2017-12-20 20:36:18 +01:00
while (argc) {
2018-10-26 23:02:07 +02:00
// Clean up
2017-12-20 20:36:18 +01:00
cmdc = 0;
2018-10-26 23:02:07 +02:00
memset(cmdv, NULL, sizeof(cmdv));
// Split the commands
for (char *tok = strtok(argv[0], " "); tok; tok = strtok(nullptr, " "))
2017-12-20 20:36:18 +01:00
cmdv[cmdc++] = tok;
2017-12-06 05:51:16 +01:00
2018-10-26 23:02:07 +02:00
if (cmdc == 0)
continue;
2017-12-20 20:36:18 +01:00
if (strcmp(cmdv[0], "test") == 0) {
2018-10-25 03:08:06 +02:00
exit(cpio.test());
2017-12-20 20:36:18 +01:00
} else if (strcmp(cmdv[0], "restore") == 0) {
2018-10-25 03:08:06 +02:00
cpio.restore();
2017-12-20 20:36:18 +01:00
} else if (strcmp(cmdv[0], "sha1") == 0) {
2018-10-25 03:08:06 +02:00
char *sha1 = cpio.sha1();
if (sha1) printf("%s\n", sha1);
2017-12-20 20:36:18 +01:00
return 0;
} else if (cmdc == 2 && strcmp(cmdv[0], "exists") == 0) {
exit(cpio.find(cmdv[1]) < 0);
} else if (cmdc == 2 && strcmp(cmdv[0], "backup") == 0) {
cpio.backup(cmdv[1]);
2017-12-20 20:36:18 +01:00
} else if (cmdc >= 2 && strcmp(cmdv[0], "rm") == 0) {
2018-11-07 08:10:38 +01:00
bool r = cmdc > 2 && strcmp(cmdv[1], "-r") == 0;
cpio.rm(cmdv[1 + r], r);
2017-12-20 20:36:18 +01:00
} else if (cmdc == 3 && strcmp(cmdv[0], "mv") == 0) {
2018-10-25 03:08:06 +02:00
cpio.mv(cmdv[1], cmdv[2]);
2017-12-20 20:36:18 +01:00
} else if (cmdc == 3 && strcmp(cmdv[0], "patch") == 0) {
2018-10-25 03:08:06 +02:00
cpio.patch(strcmp(cmdv[1], "true") == 0, strcmp(cmdv[2], "true") == 0);
2017-12-20 20:36:18 +01:00
} else if (strcmp(cmdv[0], "extract") == 0) {
if (cmdc == 3) {
return !cpio.extract(cmdv[1], cmdv[2]);
2017-12-20 20:36:18 +01:00
} else {
2018-10-25 03:08:06 +02:00
cpio.extract();
2017-12-20 20:36:18 +01:00
return 0;
}
} else if (cmdc == 3 && strcmp(cmdv[0], "mkdir") == 0) {
2018-10-25 03:08:06 +02:00
cpio.makedir(strtoul(cmdv[1], NULL, 8), cmdv[2]);
2017-12-20 20:36:18 +01:00
} else if (cmdc == 3 && strcmp(cmdv[0], "ln") == 0) {
2018-10-25 03:08:06 +02:00
cpio.ln(cmdv[1], cmdv[2]);
2017-12-20 20:36:18 +01:00
} else if (cmdc == 4 && strcmp(cmdv[0], "add") == 0) {
2018-10-25 03:08:06 +02:00
cpio.add(strtoul(cmdv[1], NULL, 8), cmdv[2], cmdv[3]);
2017-12-04 20:32:37 +01:00
} else {
2017-12-20 20:36:18 +01:00
return 1;
2017-12-04 20:32:37 +01:00
}
2017-12-20 20:36:18 +01:00
--argc;
++argv;
2017-12-01 10:17:24 +01:00
}
2017-12-03 20:14:04 +01:00
2018-10-25 03:08:06 +02:00
cpio.dump(incpio);
2017-12-20 20:36:18 +01:00
return 0;
2018-10-25 03:08:06 +02:00
}